On Fri, 30 Sep 2005 14:46:11 +0100,
wrote:

the previous owner of our house let a toilet overflow leak for a long
time,the result being a dark rust stain all down the brickwork,has
anyone any idea of a product to shift it,the brick is very soft so we
cannot use a pressure washer or a wire brush,thanks in advance

http://www.envirosafemfg.com/rust_stain_remover.htm

is a possibility. You can also try oxalic acid. It is a white crystalline
powder which will dissolve in water or dilute hydrochloric acid, which
seems to speed things up. Hydrochloric acid is corrosive and oxalic toxic.
LD50 for oxalic acid would appear to be about 25g, so accidentally
swallowing a whole ounce of the stuff would be unfortunate to say the
least. You may have to sign the poisons register at the pharmacy.

John Schmitt

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